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groups:mg:project_ptb-cavity:mode_matching_third_try [2017/10/06 13:33] – created ssauergroups:mg:project_ptb-cavity:mode_matching_third_try [2017/10/06 13:50] (current) – ssauer
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-====== Mode Matching - two curve mirrors ======+====== Mode Matching - plan and curve mirrors ======
  
 ==== Mirror configuration ==== ==== Mirror configuration ====
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     * Wavelength: λ= 1542.0 nm     * Wavelength: λ= 1542.0 nm
     * Length between the resonator mirrors: L= 480 mm     * Length between the resonator mirrors: L= 480 mm
-    * Beam radius at cavity-waist: w0+    * Beam radius at cavity-waist: w0=w2
     * Beam radius at mirror R1 and R2: w1, w2     * Beam radius at mirror R1 and R2: w1, w2
     * Distance between:     * Distance between:
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       * mirror R2/lense 1 and lense 2: X       * mirror R2/lense 1 and lense 2: X
       * mirror R2/lense 1 and collimatorlense: 600mm - X       * mirror R2/lense 1 and collimatorlense: 600mm - X
-        * 600mm (+15mm) = optical way of the incoupling breadboard (450mm) + thickness breadboard (10mm) + distance between breadboard and vacuumchamber (30mm) + distance between vacuumchamber and cavity mirror R2 (130mm) +        * 615mm = optical way of the incoupling breadboard (450mm) + thickness breadboard (10mm) + distance between breadboard and vacuumchamber (30mm) + distance between vacuumchamber and cavity mirror R2 (130mm) 
       * collimatorlense and fiber: 2.75 mm       * collimatorlense and fiber: 2.75 mm
  
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   * Nr. 1: Spiegel 1 with Brennweite  500 mm; Einfallwinkel: 0   * Nr. 1: Spiegel 1 with Brennweite  500 mm; Einfallwinkel: 0
   * Nr. 2: Abstand 480 mm   * Nr. 2: Abstand 480 mm
-  * Nr. 3: Spiegel 2 with Brennweite  500 mm; Einfallwinkel: 0+  * Nr. 3: Spiegel 2 with Brennweite  10000000000 (so viel es ging) mm; Einfallwinkel: 0
  
--> Waistradius: 457 µm; Strahlradius on the mirrors: 525.2 µm\\  +-> Waistradius: w0=w2=495.2 µm; Strahlradius on the mirrors: w1=686.7 µm; w2=495.2 µm\\  
  
 **Step 2: **\\ **Step 2: **\\
   * Change Spiegel 2 to Linse 1   * Change Spiegel 2 to Linse 1
     * Brechungsindex: 1.5     * Brechungsindex: 1.5
-    * Brennweite: -2000 mm+    * Brennweite: -4000000000000000000 mm
 <note important>The values of the Waistradius and Strahlradius must not change!!!</note> <note important>The values of the Waistradius and Strahlradius must not change!!!</note>
 **Step 3: **\\ **Step 3: **\\
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   * Zielwaist: 5.2 µm   * Zielwaist: 5.2 µm
 **Step 4: Playing with the parameters X and Y for the best Überlapp**\\ **Step 4: Playing with the parameters X and Y for the best Überlapp**\\
- 
-Case: //Mirror R2/lense 1 and collimatorlense: 600mm - X// 
-^ Lense focal length Y [mm]                      |  400   |  300   |  **250**   |  200   |  175   | 
-^ Distance between mirror R2 and lense 2 X [mm]  |  179    |  208   |  **243**   |  316   |  357   | 
-^ Überlapp [%]                                   |  83.1  |  97.6  |  **99.5**  |  87.9  |  77.4  | 
  
 Case: //Mirror R2/lense 1 and collimatorlense: 615mm - X// Case: //Mirror R2/lense 1 and collimatorlense: 615mm - X//
-^ Lense focal length Y [mm]                      |  400   |  300   |  **250**   |  200   |  175   | +^ Lense focal length: Y [mm]                      |  400   |  300   |  **250**   |  200   |  175   | 
-^ Distance between mirror R2 and lense 2 X [mm]  |  170   |  215   |  **265**   |  332   |  357   | +^ Distance between mirror R2 and lense 2: X [mm]  |  258   |  314   |  **335**   |  375   |  400   | 
-^ Überlapp [%]                                   |  83.2  |  97.9  |  **99.2**  |  87.0  |  76.3  |+^ Überlapp [%]                                   |  92.7  |  99.1  |  **99.8**  |  94.7  |  88.6  |
  
 **Step 5: Check what is happend for the wavelength 1560 nm**\\ **Step 5: Check what is happend for the wavelength 1560 nm**\\
  
 No effect! No effect!